John Michael "Ozzy" Osbourne is an English singer, songwriter, actor and reality television star who rose to prominence during the 1970s as the lead vocalist of the heavy metal band Black Sabbath, during which he adopted the nickname "The Prince of Darkness". Osbourne was fired from the band in 1979 due to alcohol and drug problems, but went on to have a successful solo career, releasing eleven studio albums, the first seven of which were all awarded multi-platinum certifications in the United States. Osbourne has since reunited with Black Sabbath on several occasions. He rejoined the band in 1997 and helped record the group's final studio album 13 (2013) before they embarked on a farewell tour which culminated in a final performance in their home city, Birmingham, England, in February 2017. His longevity and success have earned him the informal title of "Godfather of Heavy Metal".